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E. B. STOCKING Paper-Bag Machine.

No. 226,127. Patented Mar. 30, 1880.

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E.B.STOGKING.

Paper-Bag Machine.

No. 226,127 Patented Mar. 30, 1880.

( Thu/bow EDGAR B. STOCKING, OF WASHINGTON, DISTRICT OF COLUMBIA.

PAPER=BAG MACHINE.

SPECIFICATION forming part Of Letters Patent N6. 226,127, dated March 30, 1880.

Application filed February 3, 1880. v

To all whom it may concern:

Be it known that I, EDGAR B. STOCKING, a legal resident of the city of Syracuse, county of Onondaga, and State of New York, temporarily residing at Washington, District of Co'- lumbia, have invented certain new and useful Improvements in Machinery forMaking Satchel-Bottomed Paper Bags, of which the following is a description, reference being had to the accompanying drawings, in which Figure 1 is an isometrical view of a machine embodying my improvements. Fig. 2 is a central vertical longitudinal section thereof. Fig. 3 is a view, in plan and central section, of a continuous tubular blank as it appears after each successive step in the operation of the machine thereon. Figs. 4, 5, 6, and 7 are detail views, illustrating the difierent positions and effects of the external folding-blade at different stages of its operation; and Figs. 8, 9, 10, and 11 are detail views of modified arrangements of the main and principal devices of the machine. 7 i

The invention herein disclosed embodies improvements upon that secured to me by Letters Patent No. 223,960, hearing date January 27, 1880, and like that is designed to embody and practice the method secured to me by Let ters Patent No. 223,959, bearin g the same date.

The main object of the present invention is to form an intermediate transverse .fold in a tubular blank by means located and operating entirely external-that is, outside of the tubular blanksuch means having either a recip rocatory, oscillatory, or a rotary motion.

For a better understanding of the object of the invention, reference is first made to Fig. 3, where it will be seen that the first operation is slittingthe upper ply of the tubular blank, as at A. The second is cutting through both plies from the edges inwardly, as at B B, (the blank having traveled a bag-length,) thus completely severing the tubular blank except a portion, (J, of the lower (preferably the seam) ply, which portion facilitates feeding the blank through the machine. The third is forming an intermediate transverse fold, D the fourth, severing the uncut portion 0, and finally forming a transverse fold on the line E E.

The means employed to perform these operations may be described as follows, (see Figs.

, 1 and 2:) Within a suitable frame-work is supported a former, 1, above which is a rotary. slitting-knife, 2, which operates against a fixed blade, 3, on the upper surface of the former and overhanging a recess therein, which permits the rotary slitting-knife to pass below the upper surface ot'the former and complete its rotation unobstructed. In advance (in the line of feed) of the slitting-knife are the feedrolls 4 4, a bag-length in circumference, centrally channeled for the passage through between them of an extension of the former, and provided with knives 5 5. At each end of the upper one of the feed-rolls are tappets 6 6, which reciprocate the cross-bar 7 which slides upon the guides 8, and, in this instance, is retracted by the springs 9 9, (one not shown,) attached to each of two rearward projections of the cross-bar, which are provided with uprights 10 10, against which the tappets 6 6 come in contact at each revolution of the feedrolls.

Instead of this construction, the rearward projections of the cross-bar may be controlled directly by disks having cam-grooves upon their sides and mounted upon the shaft of one of the feed-rolls, thus giving a smooth even advancing and receding movement to the cross-bar. p

In advance of the crossbar 7 is located the folding-blade 11, mounted on a crank-shaft, 12, oscillating in bearings 13 upon the side frames of the machine, and provided with a crank, 14, set at'an angle thereto, and project ing from the lower edge of the folding-blade are pins15, which, when the folding-blade is o in its lowest or flattened position enter slots 16 in the extension of the former 1. Thefolding-blade is operated, in this instance, by means of the crank 14, link 18, oscillating lever 19, and the cam 20 upon the side of the gear of one of the feed-rolls, which, by contact with the tappet like portion 17 of said .lever, retains it in an extended position for a desired. time,-and then allows it'and the foldin g-blade and their connections to be retracted to their nonoperative positions by the spring 21.

Instead of this construction, the movements of the folding-blade may be produced by operating the link 18 directly by a cam, as stated with relation to the cross-bar.

feed-rolls 22 22, one being provided with the knife 23, and in advance of these are the table 24, final-folding blade 25, operated by a tappet, 33, on the gear of one of said rolls, and final-folding rolls 26 26.

The operation of my invention as embodied in the machinery just described is as follows Acontinuous tubular blank, having been made about the former 1, is slittedin its upper ply, as at A, Fig. 3, by the knives2 3, drawn along by rolls 4 4, cut, as at B B, by the knives 5 5, then passes under the-cross-bar 7 and-the nowraised folding-blade toward the rolls 22 22, when its upper ply is arrested by the pi s of the folding-blade passing therethrough as said blade is lowered to the position shown in Fig. 4. The folding-blade is held in its raised or non-operative position, as above described, for periods sufiicient to allow the arrival of successive bottom -forming portions of the tubular blank at and over the proper part of the extension of the former, when the blade is lowered to the flattened position, as aforesaid. The feed continuing, the upper ply is doubled or folded upon itself and travels over and upon the folding-blade, (see Fig. 5,) when, at the proper time, the blade is'raised to the position shown in Fig. 6, and the cross-bar 7 advances and determines the central transverse folding-line. This disposes the material of the bottom-forming portion into a substantially triangular shape, as at O D, Fig. 3, the width of the intermediate transverse fold being equal to that of the blade, and this disposition of the material is accomplished before the entry of the uncut portion 0 into the bite of the rolls 22 22, and before its severance by the knife 23. This severance immediately follows, the cross-bar recedes, and the bag-blank is fed by rolls 22 22 over and upon the table 24, and when its forward point is sufficiently advanced over the rolls 26 26 the blade 25 descends and makes the final fold on the line E E, and the rolls deliver the completed bag.

I do not wish to be understood 'as limiting the scope of my invention to the exact construction and means of operation hitherto described, as it is evident that the main and principal devices employed may, without additional exercise of invention, be arranged for use in a manner entirely difl'erent.

I have illustrated in Fig. 8 a modified arrangement of these devices, wherein the crossbar 7 is pivotally attached to the foldingblade 11 and the former 1 terminates at or near its end whey ill its flattened position. In this modification the slitting-knife 2 andside cutting-knives, 5 5, are dispensed with, and a transverse completely-severing knife is substituted, and may be located in front of it, but a suitable distance from the folding-blade. The folding-blade arrests the forward movement of the upper ply, and when the intermediate transverse fold is formed the cross-bar 7 closes down upon it, and the blade and bar pass through a movement similar to that determediate transverse fold is made.

folding-blade in lieu of the pins 15. I consider one the equivalent of the other, and neither of them is indispensable, because the foldingblade alone will arrest the movement of the upper ply; but either or both the pins and the cushion may be added to facilitate the performance of this function of the blade.

In advance of the folding-blade I locate aroll, 22, which may be in length equal to the width of the tubular blank, or very short, and located at its transverse center to retain the lower ply in position at the instant that the in- The final fold is madein the usual and above-described manner.

In Fig. 10 I have shown the main and principal devices arranged to operate with'a rotary motion. The feed-rolls 4 4, being a bag-length in circumference, are furnished with a transverse severing-knife, 5. In the coacting slot in the companion roll are pins 27, (which are not indispensable,) to retain the ends of the tubular blank after each cut is made. The former l is curved, as shown, or it may be straight, as shown by dotted lines. The folding-blade 11, actuated by its crank 14, coming in contact with a cam, 20, of suitable length, arrests the upper ply and forms the intermediate transverse fold. The companion roll'is cutaway, so that its periphery is narrow at the transverse center of the severing-line of the roll, to facilitate the formation of said fold. At a proper distance-back of the line of severance I locate a folding-jaw, 28, of usual con; struction, operated by its arm 29 coming in contact with cam 30 and coacting with the final-folding blade'25, operated by cam 31. These form the final fold, which is pressed by the roll 26, which completes the bag.

The construction vand operation of rotary cutters, folding-blades, and jaws being so well known, 1 do not deem a further description necessary. 7

In Fig. 11 I have illustrated the foldingblade 11 supported pivotally at its lower portion on the fixed bearing 13, located centrally of the machine, instead of upon its side frames,

and actuated intermittently by the reciprocating link 18. Its operation is like that of the a.

other oscillatory folding-blades described.

The folding-blade may be made of two parts attached adj ustably to the crank-shaft 12, and

the cams and tappets shown may also be adjustable for the purpose of adapting one machine for making different sizes of bags.

A supporting-roll, 32, may, if desired, be located under the extension of the former.

Other modifications of the devices will readily suggest. themselves; but I deem it proper to state relative to the method herein disclosed that any arrangement of a folding-blade adapted to make an intermediate transverse fold which locates the blade exteriorlythat is, without the tubular blank-is of my own invention.

Having described my invention and modifications thereof, what I claim as new, and desire to secure by Letters Patent, is

1. The method herein described of making an intermediate transversefold in a moving tubular blank, which consists in arresting one of its plies, doubling it upon itself on a line forming in the completed bag the junction of the bottom and a side, and laying it back from a point and by means outside of said tubular blank.

2. A folding-blade located outside of a movin g tubular blank and adapted, by means substantially as described, to form therein an intermediate transverse fold, substantially as and for the purpose set forth.

3. The combination of a former, tube-severing mechanism, exterior folding mechanism, adapted, by means substantially as described, to make an intermediate transverse fold, and final-folding mechanism, substantially as described.

4. The combination of a former, central slitting mechanism, side cutting mechanism, central cutting mechanism, and final -folding mechanism with a folding-blade adapted, by means substantially as described, to form an intermediate transverse fold, substantially as shown and described.

5. The combination of a former and feeding mechanism with a folding-blade provided with pins or their equivalent, for arresting a ply of the tubular blank, substantially as shown and described.

6. The combination of feeding mechanism, tube-severing mechanism, an exterior foldingblade adapted, by means substantially as described, to make an intermediate transverse fold, a cross-bar, and final-folding mechanism, substantially as shown and described.

7. The combination of the rotary slittingknife 2, the recessed former 1, provided with fixed blade 3, recessed feed-rolls 4 4, provided with knives 5 o, feed-rolls 22 22, provided with knife 23, and final-folding meehanism,with folding mechanism adapted, by means substantially as described, to make an intermediate transverse fold, substantially as shown and described.

8. The combination of folding-blade 11, provided with pins 15, and former 1, provided with slots 16, substantially as shown and described.

9. The combination of foldingblade 11, crank-shaft 12, link 18, lever 19, and cam 20 with the former 1 and feed-rolls 4 4, substantially as shown and described.

10. The combination of a slotted former, an-

exterior folding-blade provided with pins and adapted, by means substantially as described, to make an intermediate transverse fold, with a cross-bar and means for operating them, substantially as shown and described.

In testimony whereof I have signed my name in presence of two subscribing witnesses.

E. B. STOCKING.

Witnesses E. A. DIcK, M. GEORGII. 

